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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* arch/arm/mach-ep93xx/include/mach/uncompress.h
*
* Copyright (C) 2006 Lennert Buytenhek <[email protected]>
*/
#include <mach/ep93xx-regs.h>
#include <asm/mach-types.h>
static unsigned char __raw_readb(unsigned int ptr)
{
return *((volatile unsigned char *)ptr);
}
static unsigned int __raw_readl(unsigned int ptr)
{
return *((volatile unsigned int *)ptr);
}
static void __raw_writeb(unsigned char value, unsigned int ptr)
{
*((volatile unsigned char *)ptr) = value;
}
static void __raw_writel(unsigned int value, unsigned int ptr)
{
*((volatile unsigned int *)ptr) = value;
}
#define PHYS_UART_DATA (CONFIG_DEBUG_UART_PHYS + 0x00)
#define PHYS_UART_FLAG (CONFIG_DEBUG_UART_PHYS + 0x18)
#define UART_FLAG_TXFF 0x20
static inline void putc(int c)
{
int i;
for (i = 0; i < 10000; i++) {
/* Transmit fifo not full? */
if (!(__raw_readb(PHYS_UART_FLAG) & UART_FLAG_TXFF))
break;
}
__raw_writeb(c, PHYS_UART_DATA);
}
static inline void flush(void)
{
}
/*
* Some bootloaders don't turn off DMA from the ethernet MAC before
* jumping to linux, which means that we might end up with bits of RX
* status and packet data scribbled over the uncompressed kernel image.
* Work around this by resetting the ethernet MAC before we uncompress.
*/
#define PHYS_ETH_SELF_CTL 0x80010020
#define ETH_SELF_CTL_RESET 0x00000001
static void ethernet_reset(void)
{
unsigned int v;
/* Reset the ethernet MAC. */
v = __raw_readl(PHYS_ETH_SELF_CTL);
__raw_writel(v | ETH_SELF_CTL_RESET, PHYS_ETH_SELF_CTL);
/* Wait for reset to finish. */
while (__raw_readl(PHYS_ETH_SELF_CTL) & ETH_SELF_CTL_RESET)
;
}
#define TS72XX_WDT_CONTROL_PHYS_BASE 0x23800000
#define TS72XX_WDT_FEED_PHYS_BASE 0x23c00000
#define TS72XX_WDT_FEED_VAL 0x05
static void __maybe_unused ts72xx_watchdog_disable(void)
{
__raw_writeb(TS72XX_WDT_FEED_VAL, TS72XX_WDT_FEED_PHYS_BASE);
__raw_writeb(0, TS72XX_WDT_CONTROL_PHYS_BASE);
}
static void arch_decomp_setup(void)
{
if (machine_is_ts72xx())
ts72xx_watchdog_disable();
ethernet_reset();
}
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